(CNN) - Front-runner Mitt Romney fought back Tuesday against attacks by Republican presidential rivals the night before, defending his revised figure for jobs created by his former venture capital firm and denying that an ad by a super PAC supporting him is inaccurate.

At a brief news conference in Florence, South Carolina, Romney repeated his assertion from Monday night's debate that four companies that Bain Capital invested in under Romney's leadership created 120,000 jobs.

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Rudy NYC

We can expect Mitt Romney to defend his false claims of 100,000 jobs created by launching into his false war against all of capitalism. We can also expect Mitt Romney to blame Pres. Obama for spending and the debt ceiling. President Obama has not increased fedeal spending, but has lowered it. The annual deficits are the economic path laid out for us by the Republicans. All Republicans support the Ryan Plan, which would actually raise the annual deficits,